skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Mechanism of Additive-Assisted Room-Temperature Processing of Metal Halide Perovskite Thin Films

Journal Article · · ACS Applied Materials and Interfaces

Perovskite solar cells have received substantial attention due to their potential for low-cost photovoltaic devices on flexible or rigid substrates. Thiocyanate (SCN)-containing additives, such as MASCN (MA = methylammonium), have been shown to control perovskite film crystallization and the film microstructure to achieve effective room-temperature perovskite absorber processing. Nevertheless, the crystallization pathways and mechanisms of perovskite formation involved in MASCN additive processing are far from clear. Using in situ X-ray diffraction and photoluminescence, we investigate the crystallization pathways of MAPbI3 and reveal the mechanisms of additive-assisted perovskite formation during spin coating and subsequent N2 drying. In this work, we confirm that MASCN induces large precursor aggregates in solution and, during spin coating, promotes the formation of the perovskite phase with lower nucleation density and overall larger initial nuclei size, which forms upon reaching supersaturation in solution, in addition to intermediate solvent-complex phases. Finally, during the subsequent N2 drying, MASCN facilitates the dissociation of these precursor aggregates and the solvate phases, leading to further growth of the perovskite crystals. Our results show that the nature of the intermediate phases and their formation/dissociation kinetics determine the nucleation and growth of the perovskite phase, which subsequently impact the film microstructure. These findings provide mechanistic insights underlying room-temperature, additive-assisted perovskite processing and help guide further development of such facile room-temperature synthesis routes.

Research Organization:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC02-05CH11231; AC36-08G028308; AC02-76SF00515; SC0004993
OSTI ID:
1777974
Alternate ID(s):
OSTI ID: 1782080
Journal Information:
ACS Applied Materials and Interfaces, Vol. 13, Issue 11; ISSN 1944-8244
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English

References (59)

Thermally Stable MAPbI 3 Perovskite Solar Cells with Efficiency of 19.19% and Area over 1 cm 2 achieved by Additive Engineering journal May 2017
Monitoring Thermal Annealing of Perovskite Solar Cells with In Situ Photoluminescence journal December 2016
Self-formed grain boundary healing layer for highly efficient CH3NH3PbI3 perovskite solar cells journal June 2016
Toward All Room-Temperature, Solution-Processed, High-Performance Planar Perovskite Solar Cells: A New Scheme of Pyridine-Promoted Perovskite Formation journal January 2017
Critical kinetic control of non-stoichiometric intermediate phase transformation for efficient perovskite solar cells journal January 2016
23.6%-efficient monolithic perovskite/silicon tandem solar cells with improved stability journal February 2017
Recent progress of inorganic perovskite solar cells journal January 2019
Additive engineering for highly efficient organic–inorganic halide perovskite solar cells: recent advances and perspectives journal January 2017
The emergence of perovskite solar cells journal July 2014
The Impact of Atmosphere on the Local Luminescence Properties of Metal Halide Perovskite Grains journal March 2018
Improved performance and stability of perovskite solar cells by crystal crosslinking with alkylphosphonic acid ω-ammonium chlorides journal August 2015
A Review on Additives for Halide Perovskite Solar Cells journal April 2020
Interfacial Effects during Rapid Lamination within MAPbI 3 Thin Films and Solar Cells journal June 2019
Unreacted PbI 2 as a Double-Edged Sword for Enhancing the Performance of Perovskite Solar Cells journal August 2016
Transformation from crystalline precursor to perovskite in PbCl2-derived MAPbI3 journal August 2018
Additive engineering for high-performance room-temperature-processed perovskite absorbers with micron-size grains and microsecond-range carrier lifetimes journal January 2017
Thermal degradation of CH 3 NH 3 PbI 3 perovskite into NH 3 and CH 3 I gases observed by coupled thermogravimetry–mass spectrometry analysis journal January 2016
Simple post annealing-free method for fabricating uniform, large grain-sized, and highly crystalline perovskite films journal April 2017
Additive Enhanced Crystallization of Solution-Processed Perovskite for Highly Efficient Planar-Heterojunction Solar Cells journal March 2014
Dynamics of Antisolvent Processed Hybrid Metal Halide Perovskites Studied by In Situ Photoluminescence and Its Influence on Optoelectronic Properties journal February 2020
Crystalline Nature of Colloids in Methylammonium Lead Halide Perovskite Precursor Inks Revealed by Cryo-Electron Microscopy journal July 2020
Room Temperature Phase Transition in Methylammonium Lead Iodide Perovskite Thin Films Induced by Hydrohalic Acid Additives journal September 2016
High efficiency methylammonium lead triiodide perovskite solar cells: the relevance of non-stoichiometric precursors journal January 2015
Impact of Processing on Structural and Compositional Evolution in Mixed Metal Halide Perovskites during Film Formation journal July 2020
Triple-cation mixed-halide perovskites: towards efficient, annealing-free and air-stable solar cells enabled by Pb(SCN)2 additive journal April 2017
Confining metal-halide perovskites in nanoporous thin films journal August 2017
Monolithic all-perovskite tandem solar cells with 24.8% efficiency exploiting comproportionation to suppress Sn(ii) oxidation in precursor ink journal September 2019
Photovoltaic solar cell technologies: analysing the state of the art journal March 2019
Low-dimensional perovskite nanoplatelet synthesis using in situ photophysical monitoring to establish controlled growth journal January 2019
Employing Lead Thiocyanate Additive to Reduce the Hysteresis and Boost the Fill Factor of Planar Perovskite Solar Cells journal May 2016
Room-Temperature Formation of Highly Crystalline Multication Perovskites for Efficient, Low-Cost Solar Cells journal January 2017
Enhanced optoelectronic quality of perovskite thin films with hypophosphorous acid for planar heterojunction solar cells journal November 2015
Hybrid Perovskite Thin-Film Photovoltaics: In Situ Diagnostics and Importance of the Precursor Solvate Phases journal November 2016
Bulk heterojunction perovskite hybrid solar cells with large fill factor journal January 2015
Identifying the Molecular Structures of Intermediates for Optimizing the Fabrication of High-Quality Perovskite Films journal August 2016
Extending the Photovoltaic Response of Perovskite Solar Cells into the Near‐Infrared with a Narrow‐Bandgap Organic Semiconductor journal September 2019
Thermal engineering of FAPbI3 perovskite material via radiative thermal annealing and in situ XRD journal January 2017
Chemical Pathways Connecting Lead(II) Iodide and Perovskite via Polymeric Plumbate(II) Fiber journal December 2015
Potassium- and Rubidium-Passivated Alloyed Perovskite Films: Optoelectronic Properties and Moisture Stability journal September 2018
Mixing Behavior in Small Molecule:Fullerene Organic Photovoltaics journal March 2017
Enabling Flexible All-Perovskite Tandem Solar Cells journal September 2019
Revealing the Dynamics of Hybrid Metal Halide Perovskite Formation via Multimodal In Situ Probes journal December 2019
Crystal Structure of DMF-Intermediate Phases Uncovers the Link Between CH 3 NH 3 PbI 3 Morphology and Precursor Stoichiometry journal September 2017
Recent progress towards roll-to-roll manufacturing of perovskite solar cells using slot-die processing journal January 2020
Control of Crystal Growth toward Scalable Fabrication of Perovskite Solar Cells journal December 2018
Low-temperature-processed efficient semi-transparent planar perovskite solar cells for bifacial and tandem applications journal November 2015
Retarding the crystallization of PbI 2 for highly reproducible planar-structured perovskite solar cells via sequential deposition journal January 2014
Optical in situ monitoring during the synthesis of halide perovskite solar cells reveals formation kinetics and evolution of optoelectronic properties journal January 2020
A polymer scaffold for self-healing perovskite solar cells journal January 2016
Get the Basics Right: Jacobian Conversion of Wavelength and Energy Scales for Quantitative Analysis of Emission Spectra journal October 2013
Intermixing-seeded growth for high-performance planar heterojunction perovskite solar cells assisted by precursor-capped nanoparticles journal January 2016
Understanding how excess lead iodide precursor improves halide perovskite solar cell performance journal August 2018
Enabling room-temperature processed highly efficient and stable 2D Ruddlesden–Popper perovskite solar cells with eliminated hysteresis by synergistic exploitation of additives and solvents journal January 2019
The Second Spacer Cation Assisted Growth of a 2D Perovskite Film with Oriented Large Grain for Highly Efficient and Stable Solar Cells journal May 2019
Perovskite/polymer monolithic hybrid tandem solar cells utilizing a low-temperature, full solution process journal January 2015
Kinetic Stabilization of the Sol-Gel State in Perovskites Enables Facile Processing of High-Efficiency Solar Cells journal June 2019
Room temperature formation of organic–inorganic lead halide perovskites: design of nanostructured and highly reactive intermediates journal January 2017
Hybrid Organic-Inorganic Perovskites (HOIPs): Opportunities and Challenges journal July 2015
Perovskite solar cells with a planar heterojunction structure prepared using room-temperature solution processing techniques journal December 2013